0393659 JOHNSON THERMOSTAT

Table 1
Diagnostic Codes Table
J1939 Code and Description Conditions which Generate this Code System Response
95-2
Engine Fuel Filter Differential Pressure : Erratic, Intermittent, or Incorrect The filtered fuel pressure is greater than the unfiltered fuel pressure. The code is logged.
The value of the parameter is set to a default value.
99-2
Engine Oil Filter Differential Pressure : Erratic, Intermittent, or Incorrect The filtered oil pressure is greater than the unfiltered oil pressure. The code is logged.
The value of the parameter is set to a default value.
100-3
Engine Oil Pressure Sensor voltage above normal The ECM detects signal voltage that is above normal for one second. The code is logged.
The value of the parameter is set to a default value.
100-4
Engine Oil Pressure Sensor voltage below normal The ECM detects signal voltage that is below normal for one second.
101-3
Engine Crankcase Pressure : Voltage Above Normal The ECM detects signal voltage that is above normal for one second. The code is logged.
The value of the parameter is set to a default value.
101-4
Engine Crankcase Pressure : Voltage Below Normal The ECM detects signal voltage that is below normal for one second.
108-3
Barometric Pressure : Voltage Above Normal The ECM detects signal voltage that is above normal for one second. The code is logged.
The value of the parameter is set to a default value.
108-4
Barometric Pressure : Voltage Below Normal The ECM detects signal voltage that is below normal for one second.
1176-3
Engine Turbocharger 1 Compressor Inlet Pressure : Voltage Above Norm The ECM detects signal voltage that is above normal for one second. The code is logged.
The value of the parameter is set to a default value.
1176-4
Engine Turbocharger 1 Compressor Inlet Pressure : Voltage Below Normal The ECM detects signal voltage that is below normal for one second.
1177-3
Engine Turbocharger 2 Compressor Inlet Pressure : Voltage Above Normal The ECM detects signal voltage that is above normal for one second. The code is logged.
The value of the parameter is set to a default value.
1177-4
Engine Turbocharger 2 Compressor Inlet Pressure : Voltage Below Normal The ECM detects signal voltage that is below normal for one second.
1208-3
Engine Pre-filter Oil Pressure : Voltage Above Normal The ECM detects signal voltage that is above normal for one second. The code is logged.
The value of the parameter is set to a default value.
1208-4
Engine Pre-filter Oil Pressure : Voltage Below Normal The ECM detects signal voltage that is below normal for one second.
1390-3
Engine Fuel Valve #1 Inlet Absolute Pressure : Voltage Above Normal The ECM detects signal voltage that is above normal for one second. The code is logged.
The value of the parameter is set to a default value.
1390-4
Engine Fuel Valve #1 Inlet Absolute Pressure : Voltage Below Normal The ECM detects signal voltage that is below normal for one second.
2452-3
Generator Total Real Power : Voltage Above Normal The ECM detects signal voltage that is above normal for one second. The code is logged.
The value of the parameter is set to a default value.
3563-3
Engine Intake Manifold #1 Absolute Pressure : Voltage Above Normal The ECM detects signal voltage that is above normal for one second. The code is logged.
The value of the parameter is set to a default value.
3563-4
Engine Intake Manifold #1 Absolute Pressure : Voltage Below Normal The ECM detects signal voltage that is below normal for one second.
5578-3
Engine Fuel Delivery Absolute Pressure : Voltage Above Normal The ECM detects signal voltage that is above normal for one second. The code is logged.
The value of the parameter is set to a default value.
5578-4
Engine Fuel Delivery Absolute Pressure : Voltage Below Normal The ECM detects signal voltage that is below normal for one second.
5580-3
Engine Fuel Delivery Absolute Pressure : Voltage Above Normal The ECM detects signal voltage that is above normal for one second. The code is logged.
The value of the parameter is set to a default value.
5580-4
Engine Fuel Delivery Absolute Pressure : Voltage Below Normal The ECM detects signal voltage that is below normal for one second. System OperationUse this procedure to troubleshoot any suspect problems with the following sensors for the primary ECM:
Barometric pressure sensor
Crankcase pressure sensor
Filtered engine oil pressure sensor
Filtered fuel pressure sensor
Gas pressure sensor
Intake manifold pressure sensor
Left turbocharger #1 inlet pressure sensor
Right turbocharger #2 inlet pressure sensor
Unfiltered engine oil pressure sensor
Unfiltered fuel pressure sensorBackground InformationThe ECM performs an automatic calibration of these sensors whenever the ECM is powered and the engine is off for at least five seconds. During an automatic calibration, the ECM calibrates pressure sensors to the value of the atmospheric pressure sensor and against an acceptable offset pressure range.The ECM continuously creates a pull-up voltage on the signal wire for each sensor. The ECM uses this pull-up voltage in order to detect a problem in the signal circuit. When the ECM detects voltage that is above a threshold on the signal wire, the ECM activates a high voltage -3 diagnostic code. When the ECM detects voltage that is below a threshold on the signal wire, the ECM activates a low voltage -4 diagnostic code.Note: There may be a delay of 30 seconds in order for Caterpillar Electronic Technician (ET) to display an active diagnostic code. When you check for a diagnostic code, be sure to wait at least 30 seconds.The following components can cause these codes:
Electrical connector or wiring
Sensor
ECMThe most likely cause of a code is a problem with an electrical connector or wiring. The least likely cause of a code is the ECM.
Illustration 1 g03321934
Typical primary schematic
Illustration 2 g03337266
P1 ECM connector
(P1-2) Analog sensor supply
(P1-3) Analog return
(P1-15) Left turbo inlet pressure
(P1-27) Right turbo inlet pressure
Illustration 3 g03337262
P2 ECM connector
(P2-15) Intake manifold pressure
(P2-16) Fuel pressure (unfiltered)
(P2-17) Analog return
(P2-27) Fuel pressure (filtered)
(P2-28) Filtered oil pressure
(P2-30) Analog return
(P2-33) Crankcase pressure
(P2-41) Gas pressure
(P2-54) Analog return
(P2-65) RH turbo turbine inlet pressure
(P2-66) Unfiltered oil pressure
(P2-72) Analog sensor supply
(P2-73) LH turbo turbine inlet pressure
(P2-78) Barometric pressure
(P2-80) Analog sensor supply
(P2-81) Analog sensor supply
(P2-82) Analog sensor supply
(P2-83) Analog return